<meta charset="utf8"></head><body>Técnica de tórax fechado para lesão miocárdica murina de isquemia-reperfusão

<ol>
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<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
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			<td>Purdue Pharma</td>
			<td>25655-41-8</td>
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			<td>Reckitt Benkiser Healthcare</td>
			<td>NDC 12496-0757-1</td>
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			<td>Carp Zoom Styl Knijplood 2.1 g (lead fishing weights)</td>
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			<td>Fine Science Tools</td>
			<td>11231-30</td>
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			<td>Dumont #5 Forceps</td>
			<td>Fine Science Tools</td>
			<td>11251-30</td>
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			<td>Fine Scissors</td>
			<td>Fine Science Tools</td>
			<td>14040-10</td>
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			<td>Leo Pharma</td>
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			<td>Abbott</td>
			<td>NDC 5260-04-05</td>
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			<td>KD Mouse/Rat Eye Speculum</td>
			<td>World Precision Instruments</td>
			<td>501897</td>
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			<td>KD mouse/rat eye speculum</td>
			<td>World Precision Instruments</td>
			<td>501897</td>
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			<td>Ketamine</td>
			<td>Dechra</td>
			<td></td>
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			<td>Light source</td>
			<td>Zeiss</td>
			<td>KL 1500 LCD</td>
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			<td>MRI system&#160;</td>
			<td>Bruker BioSpin, Ettlingen, Germany</td>
			<td>BioSpec 70/30</td>
			<td></td>
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			<td>NatriumChloride 0.9%</td>
			<td>Baxter</td>
			<td></td>
			<td></td>
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			<td>Nocturnal Infrared Heat Lamp</td>
			<td>Zoo Med Laboratories, Inc.</td>
			<td>RS-75</td>
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			<td>ParaVision software&#160;</td>
			<td>Bruker BioSpin</td>
			<td>version 6.0.1&#160;</td>
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			<td>polyethylene tubing PE-10</td>
			<td>SAI Infusion technologies</td>
			<td>PE-10</td>
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			<td>polyethylene tubing PE-50</td>
			<td>SAI Infusion technologies</td>
			<td>PE-50</td>
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			<td>remote IRI tool (PMMA)</td>
			<td>homemade</td>
			<td></td>
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			<td>Rodent Surgical Monitor</td>
			<td>Indus instruments</td>
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			<td>Segment v4.0</td>
			<td>Medviso, segment.heiberg.se</td>
			<td>R12067</td>
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			<td>Self-gated gradient echo sequence&#160;</td>
			<td>Bruker BioSpin, Ettlingen, Germany</td>
			<td>IntraGate, ParaVision 6.0.1</td>
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			<td>Slim Elongated Needle Holder</td>
			<td>Fine Science Tools</td>
			<td>12005-15</td>
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			<td>Sure-Seal Mouse/Rat Induction Chamber</td>
			<td>World Precision Instruments</td>
			<td>EZ-178</td>
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			<td>Tubing Connectors, Poly, Y Shape</td>
			<td>Westlab</td>
			<td>072025-0001</td>
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			<td>Ultraverse 035 PTA Dilatation Catheter: 5mm x 40mm, 17 ATM RBP balloon on 130 cm long catheter</td>
			<td>Bard Peripheral Vascular, Inc.</td>
			<td>00801741092671</td>
			<td></td>
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			<td>Veet (depilatory creme)</td>
			<td>Reckitt Benkiser Healthcare</td>
			<td></td>
			<td></td>
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			<td>Ventilator, MiniVent Model 845</td>
			<td>Hugo Sachs</td>
			<td>73-0043</td>
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			<td>Vidisic</td>
			<td>BAUSCH &#38; LOMB PHARMA</td>
			<td>685313</td>
			<td></td>
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			<td>Xylazine</td>
			<td>Bayer</td>
			<td></td>
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		</tr>
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</table>

remotely triggered lad occlusion using a balloon catheter in spontaneously breathing mice

Acute myocardial infarction (AMI), a prevalent global cardiovascular condition, is associated with high mortality rates and morbidity1. Despite technological advancements that enabled early and effective revascularization strategies for AMI patients, patients still experience myocardial ischemia-reperfusion injury (IRI) following these interventions2. Therefore, understanding the fundamental mechanisms and formulating approaches to mitigate IRI is crucial. IRI represents a complex pathophysiological state involving a multitude of intricate biological processes. These encompass regulated cell death, oxidative stress responses, inflammation, wound healing, fibrosis, and ventricular remodeling. Animal models, such as mice, have been of great importance for IRI research and are extensively employed due to their cost-effectiveness, rapid breeding, and the wealth of mechanistic information from transgenic models3.
This protocol presents an innovative technique&#160;to remotely induce IRI in spontaneously breathing mice with a closed chest, more closely mimicking the human pathology. Remote occlusion was achieved by utilizing a balloon catheter positioned at a distance from the myocardium to occlude the left anterior descending artery (LAD). This approach offers continued access to the beating heart at the exact moments of occlusion and reperfusion, facilitating simultaneous imaging modalities, including ultrasound or magnetic resonance imaging (MRI). These noninvasive methods could provide crucial insights into tissue responses before, during, and after occlusion and reperfusion events.
Various surgical techniques exist to induce IRI in murine models. Surgical trauma stemming from thoracotomy in open-chest models of coronary ligation triggers an immune response&#160;impacting diverse mechanisms associated with ischemia and reperfusion. Activation of the innate immune system holds the potential to influence the extent of myocardial infarction4. The proposed adapted technique provides a potential approach for exploring myocardial pre- and postconditioning and possibly reducing the impact of the innate immune response to surgical trauma in murine IRI studies by minimizing the open thorax timeframe to a maximum of 5 min. Moreover, the newly developed technique might also contribute to reducing the pro-inflammatory sequelae caused by ventilator-induced lung injury5. However, the combined effects of this new closed chest method would require further in-depth investigation.
Thorough validation of the proposed technique was conducted by comparing it with the traditional method, which involves exposing the LAD through surgical chest dissection and ligature-induced occlusion for 30 min. Results from both techniques were compared, which included troponin measurements reflecting cardiac infarct size, assessments of the area at risk using MRI with gadolinium contrast enhancement, histological triphenyl tetrazolium chloride (TTC) staining, and the determination of final scar sizes via Sirius Red (SR) staining. The outcome demonstrates the robustness and efficacy of the proposed approach for studying ischemia-reperfusion injury in murine models.

<meta charset="utf8"></head><body>Autor em destaque: uma nova técnica padronizada para imagens biomédicas em tempo real de lesão miocárdica aguda

Oclusão LAD acionada remotamente usando um cateter de balão em camundongos que respiram espontaneamente

Scope of our research is to develop a new standardized technique for marine ischaemia-reperfusion injury. This allows us to obtain real-time biomedical imaging, creating new insights into the mechanistic effects of acute myocardial injury. The most challenging parts in the development of this model was to create a well-controlled direct access to the coronary vessels.This needs to happen in a living, spontaneously breeding animal one meter further away. Its capacity to reduce surgical trauma, to enhance control over ischemia time and to improve experimental consistency underscores its significance. Additionally, our technique allows us to obtain real-time imaging during acute myocardial infarction or myocardial ischemia-reperfusion injury.

Read this Scientific Article Protocol about Author Spotlight: A Novel Standardized Technique for Real-Time Biomedical Imaging of Acute Myocardial Injury at JoVE.com

Acute myocardial infarction (AMI) is a prevalent and high-mortality cardiovascular condition. Despite advancements in revascularization strategies for ...

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Research

JoVE Journal

Medicine

Remotely Triggered LAD Occlusion Using a Balloon Catheter in Spontaneously Breathing Mice

611 visualizações.  KU Leuven. O escopo de nossa pesquisa é desenvolver uma nova técnica padronizada para lesão de isquemia-reperfusão marinha. Isso nos permite obter imagens biomédicas em tempo real, criando novos insights sobre os efeitos mecanicistas da lesão miocárdica aguda. As partes mais desafiadoras no desenvolvimento deste modelo foram criar um acesso direto bem controlado aos vasos coronários.Isso precisa acontecer em um animal vivo e reprodutor espontâneo a um me...